<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <script src="jquery-3.1.0.min.js"></script>
    <style>
        #div{
            width: 100px;
            height: 100px;
            margin: 50px;
            padding: 50px;
            border: 2px solid blue;
            background-color: blueviolet;
        }
    </style>
</head>
<body>
   <div id="div">hello</div>
    <script>
        $(document).ready(function(){
            alert($("#div").height());
         })
    </script>
</body>
</html>